Abstract
EMBRYONIC DEVELOPMENT OF THE INDIAN NATIVE KILLIFISH APLOCHEILUS LINEATUS FROM THE RIVER TAMBRAPARANEI

J. Michael Antony Prabhu Arachi*

ABSTRACT

The characteristics and stages of early development of A. lineatus, a cyprinodont fish endemic to India, were obtained from in vivo observations of embryos reared under laboratory conditions. Gravid females produced 25 - 30 eggs in a batch. Eggs measured 1 - 1.2mm in diameter, were phytophilic, and possessed a transparent chorion. Eggs were attached to the aquatic plants using sticky filamentous projections of the chorion. The incubation period of A. lineatus was found to be 9 - 12 days. The index of hatching was 96%, and that of fertility was 96.3%. Early development was divided into 11 stages, similar to the development in other killifishes. The hatchlings were transparent and measured 4 - 6 mm in TL. The yolk sac got fully absorbed on the 9th day. The fingerlings appeared more like adults.

Keywords: Killifish, Embryonic development, Diapause, Aplocheilus lineatus.


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